Features: The catheter is made from premium silicone,which has excellent biocompatibility. The Three-Way Valve design controls the flow of fluids for infusion therapy,no Heparin flushes needed. a.Valve opens inward for sampling under negative pressure. b.Valve opens outward for infusion under positive pressure. c.Valve remains closed to prevent air embolism,blood reflux and clotting under neutral pressure. The connection between the tip and the tube is smooth and seamless,which does not stimulate the vessel wall and is not easy to form thrombosis. The catheter is radiopaque and can be detect the position of the catheter under X ray. The catheter proximally trimmable,customizes to individual patient's anatomy. The configuration of puncture needle,guidewire and peelable sheath can puncture under ultrasound guide,increase the rate of puncture success.